/// Msaa el 5ra
#pragma GCC optimize("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include "bits/stdc++.h"

using namespace std;

#define pb push_back
#define F first
#define S second
#define f(i, a, b)  for(int i = a; i < b; i++)
#define all(a)  a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define sz(x) (int)(x).size()
#define mp(x, y) make_pair(x,y)
#define popCnt(x) (__builtin_popcountll(x))
#define int ll

using ll = long long;
using ii = pair<int, int>;
using ull = unsigned long long;

const int N = 5e5 + 5, LG = 18, MOD = 1e9 + 7;
const long double PI = acos(-1);
const long double EPS = 1e-7;

void doWork() {

    string s;
    cin >> s;
    if (s.size() & 1) {
        cout << "Keine Loesung\n";
        return;
    }
    vector<int> stk;
    string ans(s.size() / 2, '.');
    for (int i = 0; i < s.size(); i += 2) {
        if (s[i] != s[i + 1]) {
            cout << "Keine Loesung\n";
            return;
        }
        if (stk.empty() || s[stk.back()] == s[i]) {
            stk.push_back(i);
        } else {
            ans[stk.back() / 2] = '[';
            ans[i / 2] = ']';
            stk.pop_back();
        }
    }
    if (stk.empty())
        cout << ans << '\n';
    else
        cout << "Keine Loesung\n";

}

int32_t main() {
#ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif // ONLINE_JUDGE

    int t = 1;
//    cin >> t;
    while (t--) {
        doWork();
    }
}